MACHINE READY FOR ATTACHMENT 6.2.2.2 MAINTENANCE The hydraulic system does not require any maintenance operation and inspection other than those prescribed for the machine. For the maintenance operations required for the equipment, see the specific operation manuals. 6.2.2.3 BLEEDING AIR After connecting the piping, bleed the air from the circuit. 1. Starting engine Start the engine according to "3.3.1.5 STARTING ENGINE" keep running the engine at low idling for 10 min- utes, and carry out the following procedure. 2. Bleeding air from cylinders Operate each cylinder 3 or 4 times to the end of its stroke.
IMPORTANT If, at first, the engine is run at high speed or the cylinder is operated to the end of its stroke, the air insi- de the cylinder may cause damage to the piston packing or other parts. 3. Bleeding air from attachment (if equipped) For machine equipped with attachment such as the breaker, actuate the attachment pedal about 10 times to bleed the air completely from the attachment circuit while running the engine at low idling. IMPORTANT If the attachment bleeding procedure is specified by the manufacture, bleed the attachment according to such procedure. 4. Operation. 5. After completion of bleeding the air, stop the engine, and wait for at least 5 minutes before starting operations.
In this way, the air bubbles are removed from the oil inside the hydraulic tank. 6. Check for any leakage of oil, and wipe off any oil that has been spilled. 222